岩矿测试2026，Vol.45Issue(3)：542-554,13.DOI:10.15898/j.ykcs.202602110046
库尔勒地区地下水氢氧稳定同位素沿蒸发线展布的水循环机制
Mechanism of Water Cycle Inferred from the Distribution of Hydrogen and Oxygen Stable Isotopes in Groundwater along the Evaporation Line in the Korla Region
摘要
Abstract
In Northwest China,water resources are in short supply,and the evaporation process typically represents the ineffective depletion of water resources,thus constituting a crucial aspect in water cycle research.In the Korla region,the hydrogen and oxygen stable isotopes,δD and δ18O,in groundwater are distributed along the evaporation line,suggesting a pronounced evaporation process during the regional water cycle.In this work,laser isotope spectrometry was utilized to measure the isotopic abundances of various water bodies within the Kaidu-Kongque River Basin.The characteristics of hydrogen and oxygen stable isotopes were analyzed,the evaporation fractionation process was inverted,and a comprehensive systematic analysis was carried out in conjunction with the basin's water cycle.The results indicate that the mountainous upper Kaidu-Kongque River Basin serves as the groundwater recharge zone.The fitted line for δD and δ18O in water bodies is δD=8.67×δ18O+24.01,demonstrating a distribution pattern along the meteoric water line.In the midstream Yanqi Basin,the fitted line for δD and δ18O in groundwater is δD=8.18×δ18O+18.35,also showing a distribution along the meteoric water line.The spatial distribution differences are governed by the fractionation effect during the precipitation process.As precipitation clouds move from east to west,δD and δ18O gradually become depleted.Bosten Lake,situated in the midstream,serves as the discharge terminus of the Yanqi Basin and the sole water source for the downstream Kongque River.It is also the primary site for surface water evaporation within the Kaidu-Kongque River Basin.The inversion of isotopic evaporation fractionation in the lake water reveals that the evaporation ratio can reach 43.4%±5.1%.The groundwater in the downstream Korla region is predominantly recharged by the Kongque River water.The fitted line for δD and δ18O is δD=4.58×δ18O-19.91,exhibiting characteristics of distribution along the evaporation line.The inversion calculation of evaporation fractionation indicates an average evaporation ratio of 18.3%±2.3%.This distribution characteristic is clearly inherited from the evaporation fractionation effect in the midstream Bosten Lake.Given the relatively large groundwater depth in the Korla region,the likelihood of large-scale surface water evaporation during the runoff process can be excluded.关键词
开都河—孔雀河流域/氢氧稳定同位素/激光同位素光谱法/分馏反演/地下水/降水/蒸发Key words
Kaidu-Kongque River Basin/stable isotopes of hydrogen and oxygen/laser isotope spectrometry/fractionation inversion/groundwater/precipitation/evaporation分类
天文与地球科学引用本文复制引用
马洪云,李成柱,马红娜,王化齐,李彦娥..库尔勒地区地下水氢氧稳定同位素沿蒸发线展布的水循环机制[J].岩矿测试,2026,45(3):542-554,13.基金项目
新疆第三次科学考察项目(2022xjkk0300) （2022xjkk0300）
陕西省重点研发计划项目(2024SF-YBXM-562) （2024SF-YBXM-562）
